Telephone system



FD. U1, 15933. W, HAT-[QN 1,897,048

TELEPHONE SYSTEM Filed Sept. l, 19514 2 Sheetsheet l INVENTOR w, #ANON BV:

TTORNE .V

VU. HATTO N TELEPHONE SYSTEM filed sept. 1, 1931 ML F/G. 3

2 Sheets-Sheet 2 AHORA/.EV

Patented Feb. 14, 1933 PATENT FFICE WILLIAM HATTON, OF PAR-IS, FRANCE, ASSGNOR TO 'WESTERN ELECTRC COMPANY,

INCORPORATED, OF 11' RV YORK,

. Y., A COEORJATI-ON Ol NEW YORK TELETHONE SYSTEM.'

Application filed September 1, 1931, Serial No. 560,554, and. in France Tjecember-l, 1930.

This invention relates to telephone systems and more particularly to a. system in which connections may be set up either Wholly r in part by means of automatic switching mechanisms. rlhe invention is particularly applicable to a telephone system employing means for giving an indication as to the presence of certain kinds of faults, particularly the occurrence of false calls and an object of the invention is to provide an improved system of this type.

According to one feature of the invention, a circuit arrangement is provided in which the presence of false call on a calling line is adapted to cause the partly set up connection to seize a false call circuit which is then adapted to set itself to a deiinite position depending on the designation of the calling line and to control the mechanism associated therewith which is adapted to indicate the line on which a false call is present. Preferably the arrangement is such that the presence of a false call causes the registering mechanism or sender to transmit a signal to the link circuit or district selector whereupon the auxiliary controlling` switch mechanism of the latter moves into a position in which a circuit is completed for moving the false call circuit into connection ywith the calling line.

As soon as the false call signal has been transmitted, the presence of such false call is registered in the link circuit or district selector and the registering mechanism is automatically released for another call.

Furthermore, as soon as the false call signal is transmitted to the district selector, the false call circuit is brought into operation and as soon as the latter establishes connection with the line on which a false call is present, an indicating signal is operated and the district selector is automatically released for another call, and the line on which the false call is present automatically connected to a device by means of which such line may be tested from an operators position, or if desirable, connected to the wanted line.

The switching mechanism which is normally employed for hunting for and connecting with a calling line is so arranged that a brush of such switching mechanism is adapted to test for the calling line and is also adapted to complete a circuit for setting another switching device which is adapted to hunt for a calling line in the event of a false call having been extended thereover.

The calling line is preferably extended to the registering mechanism or sender over one of a plurality of iinder switches which may be associated with a special linder switch for dealing with false calls, means being provided vwhereby after a calling line has been extended to a sender over one vfinder switch, the simultaneous hunting` of the associated false call ii `der and of another :finder switch having access to the same group of calling lines is prevented and whereby the finder switch is given priority over the false call finder switch associated therewith. These and other features of the invention will be more clearly understood from the following detailed description which is given in .conjunction with the accompanying drawings, in which:

Fig. 1 shows a lay-out diagram of the circuit embodying the invent-ion;

Fig. 2 shows a subscribers line circuit, a portion of a line finder district selector circuit with the brushes of the selector and of the sender selector; and,

Fig. 3 shows a false call circuit having a finder switch for establishing a connection with the calling line shown in Fig. 2.

It is thought that the invention will be understood best by first considering the lay-out diagram shown in Fig. 1. When a call is initiated by subscriber 100, a line iinder 101 is set in motion and extends the calling line to a district selector' circuit 102, whose sender selector 103 hunts for a free sender 1104. The

district selector switch itself is indicated by Vai ' which at its right contactcompletes acircuit pleted for operating a false.` call finder 109 5 impulses to a switching mechanism 110 in the alsecall circuit-111. The false call finder 109 will stop on the terminals of ythe calling line and when it reaches the latter, the switch r 1 10` of the vfalse call` circuit will-have moved into a positionin which the particular line onwhich the! `alsecall is present will beindi-V cated in the false call circuit. v

The .circuit is so arranged the latter is at 'once freed for another call.

Furthermore, as soon as the falsecallnder 109 has established connectiomwith the calling line the wholelinc finder 'district selector circuit is made qfreefor another call, the con@ n'ection from' thev line on whichk a alse'call is fl present'bei'ng maintainedto the false call circuit 111 over the false call iinder; y j Referringnow to F'gs. 2 and 3, theopeifai tion ofthe Vcircuit will Ybe Vdescribedr in Fig-2 the usual subscribers line circuit is shown connectedto the bank" cfa 200point 30 line finder, the lterminals.ofl which yare strapped to the bank of the falseffcall finder. A skeleton* district selector circuitv is shown Y connected with' the `brushes "of the 20G-point line finder onfthe left and the brushes of a dis-fy trict selector n switch, on the right. Thebrushes of thesender selectorare shown-'in the lower right handcornerof'li'gf, it being i understood that these ybrii'shes establish con- 40. -nection with la controlling register sender in j L derstood that in. Fig. 2 only those parts of the the usualwell-knownmanner. @It isto be un-v :district selector circuit'fare shown which are 4vnecessary fork a complete understandingof the invention, the position of the remaining 45 parts of the circuit which have. beenoniitted and whichwill b e necessary whenthe circuit is used-in practice being indicated by dotted lines.l

\ Whena calling subscriber 200 -lifts liisre-` ceiver, a circuit is closed for line Arelay 201 for the start relay 202 of the line finder 210.

line finder Vbrushes around until they meet the terminals of the calling line, whereupon the -testfrelay 203 operated overcain'204, ,brushV 214 and the left front contact'of relay 20.11to` battery, breaking the 'circuit-ofmagnet 215,

'205 for relay' 310in Fig'. `3 'which energizes and prevents the Y false call finder 'from-ener'-V and stopping the brushes on the ,calling line. Y Relay 202 also closes a circuit over conductor with relay 206 which in'turn energizes relay lays'220 and 221 which energize over the loop of vthe calling line. -,Relay ,220 closesfacircuit which causes the sequence switch 230 to move sender andrelays 220 and 221l are disconnected. The sendercauses the lineto be extended over the selector switch 250 in the manner `well-knownin'the art. f

lf, after the connection has been-extended mitted, that is, if ai falsefcall or-permanent signal condition should develop on the calls ing line, after a predeterminedtime interval has elapsed, the sender connects ground' over brush 244v `and ca1n7222to operate sequence' switcliv230 and to drive the latter into aspecialfalsecallposition which lmay bey indicated lay 810 over'condu'ctor 311, lower' left and upper right contactsof' camV 204, to brush 214 and thence to the terminal of the falsecall 1 .'lhe connection' oi groundwto drive the sel quence switch 230'into the; special falsefc'all position,-isbrought about 4by a relay'intho senderwhich operates under thc' c'ontrol of a timing mechanism 249 and this relayY on ,opi

erating also brings about thereleaseV v of Vthe sender vand renders the latter lfree ff'orl ',another callfflh operation ofthe sender in response tothe timing mechanism 249 isset `forth injBritish Patent 256,544 tothe Western Electric Company, Ltd, accepted August TheK4 start relaySOO-dcloses the circuit for the magnet 326 ofthefalse call finder from ground` over the right back contact of relay 302,'outer'left baclrcontact of relay 303, outerV i i right ront'contact oflrelay 300 to the winding of magnet Y326% andbattery. kRelaypBOO also. connects groundto lthe winding of test -relayl 302 and atf its louter left contact 'i prepares the circuit of relay 304, y Relay V301 r0 @Ia6es themagnets 331 and-3410i the step# by-step switches 330 and 340 from ground at A the contact of relay 301, back contact of relay 304, through the. winding of magnet 331, andoverthenornial contacto'f brush 333to the vwinding of magnet 841 andbattery. The false' ca -llffinder 320 starts from the normalfpo'sition under the control of magnet 4'to aposition where the connection is extended v e 'e Y, i,overfthe brushes of sender selector 240 to the that on the oc-y `currence'offafa'lse call,` as lsoon asthe se` qu-ence switch of the districtselector circuit 102 has moved into the false call position in*` response to the signal from they-sender 104, e y A i to the sender, no dialingimpulses are transfinder 320'fto which "brush 324 has accessi Cil 326 and at each step operates relay 304 over brush 325, breaking the circuit of magnet 331 which causes switch 330 to advance one step. Relay 304 upon its first energization also opens the circuit ot magnet 341 thereby advancing switch 340 one step. At each tenth step ot call finder 320, magnet 341 is connected in parallel with magnet 331 and makes one step.

TWhen the line is found, battery is connected over brush 324 to relay 302 which operates to ground at the front contact ot relay 300, opens the circuit ot magnet 326 and locks in series with the slow operating relay 305 over an obvious circuit. At the lett front contact or relay 305, a circuit is closed from ground through the winding ot relay 305 and the winding of relay 303 to battery. Both relays 303 and 305 operate in this circuit.

Relay 303 at its outer left back Contact further opens the circuit of magnet 326 and at its left iront Contact connects ground from the front contact ot relay 306 over brush 323 to the winding of the subscribers cut-off relay 208 thereby short-circuitingrelay 209 in the district selector (Fig. 2) which falls back and releases the district selector. After the short circuit of relay 209, the release ot the district selector tralies place in a manner well-known in the art and it is not considered necessary therefore to show the circuits controlled by relay 209. Over the outer right contacts or" relay 303, relay 307 and jack 318 are connected b y way of brushes 321 and 322 to the snbscribers loop and relay 307 operates. Relay 303 is held operated over the lett front Contact of relay 307 to ground at bach contact of relay 302 which releases as soon as the district selector releases. Relay 303 also connects battery over its inner right Contact, to the` winding of the time alarm magnet 308, which controls brush 309.

Relay 307 also connects ground'trom the back contact of relay 302 over the right back contact oit relay 312 to lamp 317. lhen the operator observes this lamp, she inserts the plug ot her cord circuit in jack 318, completing a circuit from battery at the inner right front contact of relay 303, winding` ot relay 313, sleeve of `jack 318 to ground in her cord circuit. Relay 313 disconnects relay 307 from the subscribers line, but holds relay 307 operated over its inner left and right contacts and resistance 314. At its middle right Contact relay 313 completes a circuit for relay 312 to battery at the contact of relay 303. Relay 313 also connects ground to the time alarm magnet 308 causing that time alarm to start to operate. The circuit of the time alarm magnet is also maintained at the front contact of relay 312 should the plug be withdrawn from `jack 308 before the trouble is cleared. The ground at the right contact ot relay 312 also holds that relay operated. The

operation of relay 312 extinguishes lamp 317 and closes a circuit for lamp 315. The operator is now connected to the subscribers line and may talk or make any desired test on that line.

As has been explained above, the brushes of switches 330 and 340 will have been set in a. position depending on that of the false call finder. Therefore, by pressing key 316, ground will be connected over brushes 332 and 342 to the indicator lamps. The position of switch 330 corresponds to the units digit and the position of switch 340 to the tens digit of the group of lines in which the calling line is located. rIhe position ot brush 342 of switch 340 indicates whether the subscriber is in the odd or even hundredV of the group, while the jack itself identities the group of two hundred lines.

It the subscriber does not release or the trouble is not cleared when a certain time has elapsed after the energization of the time alarm 308, ground is connected over brush 309 to lamp 317 and both lamps 315 and 317 are lighted.

lVhen relay 313 operates in response to the insertion ot the operators cord circuit in jack 318, relay 319 is operated over the outer right contact of relay 313 and locks over the oil' normal contacts 328, 335 and 345 of switches 320, 330 and 340, respectively. Then the subscriber releases or the trouble is cleared, relay 307 releases in turn releasing relay 303. Circuits are thereupon closed from ground at the outer front contact of relay 319, over the inner back contact ot relay 303 and the oft norma-l contacts 327, 334 and 344 to magnets 326, 331and 341 respectively, restoring switches 320, 330 and 340 to normal. l/Vhen all three switches have reached normal position the holding circuit of relay 319 is opened and that relay releases.

lVhat is claimed is:

1. In a telephone system, a subscribers line, a selector switch for extending calls from said line, a register sender for controlling said selector switch, means responsive to the initiation or a call on said line to associate said selector switch and said sender with said line, and auxiliary means responsive to a false call on said line to connect said line with an operators position independent of said selector switch.

2. In a telephone system, a subscribers line, a selector switch for extending calls from said line, a register sender for controlling said selector switch, means responsive to the initiation of a call on said line to associate said selector switch and said sender with said line, and auxiliary means responsive to a. false call to connect said line with an operators position independent of said sender and said selector switch.

3. In a telephone system, a subscribers line, a selector switch for extending calls from said line', aregisterfsender -`for control-v ling saidselector switch, means responsive to thefinitiation of a call on said line toasso-V ciate said selector'fswitch and said sender with -said line, and means responsive to' a "false call on said line to disconnect saidsender vand said selector switch from saidline.

' 1 s 4. `In a telephone system, a si`bscribers line, ahselector switch for Vextendingcalls from said line-,5a register sender forcontiol-Y ling said selector switch, means responsive to vthe initiation ofa call'onsaid linel *to-associate 'said selectorswitch and saidvsender with said line, and means responsivevto a false call on saidlin'e to disconnect said send- Ver andsaid selector switch'tro'm said line,l and:V

` to connect said line ,witlian operators posi-y A 22oY tion. c 5. In a telephone; system, .a subscribers eline, a `selector switch for-*extending callsV from said linefa register sender for. controllingfsaid selectorV switch, `means responsive to the initiation-ofacall .on said line to associa'te said selector switch and said .sender with said line, and means responsive toa Vfalse call onsaid line to disconnect saidlsender' and said selectorswitch romsaidl'ine5 yto confV nect said line with an operators position,` l vland toidentity said line;v if .t s,

Y 6. In a telephone system,asnbscribers line,

a selector, switch orlextending calls from 'Y said line,`a register Y.sender for' controlling said selector switch, means responsive to thel iiiitiationo acall on-said line to associate" said selector switch and said sender with said line, and means responsive to a false call on said line to disconnectxsaidsender and lsaid selector switch from saidline, to connect said Y line with an operators position', and to prepare a visual indication of the 'identity- 03E said line. Y Y Y v Y "7. In a telephone system,lafsnbscrihers line, a selector switch for extending vcalls from 3 saidV line, a register-senderffor controlling A. .v

f initiationofacall on said line'to associate said selector switch and said-senderjwith said said selector switch, means-responsive tothe line, and' f means responsive; to 1 al 'alse call effective,afterameasured timeinterval to dise connect saidA sender 4 and said selector switch fromsaid line. t L v Sg'In a ltelephone systeiniasuhscribers line, afselector switch for extendingcalls 'from vsaidv line', a register senderzior controllingr said selector switch, means responsive to the Y initiation of a call'on said linevtoas'sociate said `selectorswitchand said sender'witli said line and means responsive to aalse call-eective 'y after a measuredtime interval to disconnect a` 60. i to connect saidline with anfoperatorspos'i Y 'ti'on and to prepare a visugal'indic'ation ot the identity of said line. I

said sender` and saidnselector from said line,

,29. InA .a telephone Vsystermg,asiiloscriloefs lineya: selector switch forextending' calls fromsaidfline, a register sender l,for controllingi said. selector switch',v means .responsive to-th'e initiation of a-call 'on said line to associate said selector vswitchand said sender vwith vsaid line, means: responsive tofa false call on saidline tocause said sender to transmit a signal to said selector switch, an auxiliary finder switch', andmeans'under thefcon- V with `said line, an auxiliaryl finder switch,V

and means responsive to! a vfalse ,call'on lsaid line, effective after said line has been associated withsaid selector switch andsaid sender tocausesaid finder switch to hunt for and indsaidgline. v f kl1. nla telephone systemfa subscribers fiine; av selector switch for extendingA calls `trom said line,l a register: senderifor control- -lingsaid selectorY switch, means responsive tothe( initiation of av call on said line to asso? ciatersaidV .selectorV switch and saidsende'r with said 'line,1 an auxiliaryftinde'r switch, means-responsiveft a false call on saidline, eii'ective after said lineihas beenfassociated with-said selector switch andjsaid sender to canse. said finder .switch to hunt for and Vnd Ysaid line, and: means responsive to the assoi ciation of. said finder switch with said :line

to disconnect said line.

selector switch from said *12in telephonesystem, a subscribers line, la selector switch @tor extending calls from said line, p a registerrsender.' for Y controlling saidselector switch,` means responsiveto V theinitiation, ofajcall on said line toassociate said selector switch and said-sender with.

said Vlin-e,` an auxiliary Vriiiderfswitch, anjopfalsenall :on said lineieiective after saidline has been yassociated with said selector switch `and said sender 'to causesaid inder'switch said lino tosaidoperators position.-v f

line,V a selector switch for extending -calls from Asaid line, a register sender for controllingsaid selectorswitch,v means responsive to the initiation of a call onsaid linev to asso'- ciate 'said selector' switch and said sender with said'line, a finder switch; means respon- 'sive'to a false call on said line to cause said. tinderswitch tolhunt forA and findvs'aid line7` and means'V operated/from saidjnder' switch in huntingfor said lineto indicate/the iden# A tity of said line'. Y i 14. 1n a .-telephone;

system,` a snloscribers tohnnt'for "and find saidV lineV and to extend;

i. 13. In atelephone system', a subscriber?s erators position, andmeansk responsive toa-k line, a selector switch for extending calls from said line, a register sender for controlling said selector switch, means responsive to the initiation of a call on said line to associate said selector switch and said sender with said line, a finder switch, means responsive to a false call on said line to cause said finder switch to hunt tor and find said line, an indicating mechanism, and means controlled hy said finder switch in its hunting operation for setting said indicating mechanism.

l5. In a telephone system, a snbscribers line. a selector switch for extending calls troni said line, a register sender t'or controlling said selector switch, means responsive to the initiation of a call on said line to associate said selector switch and said sender with said line, a finder switch, means responsive to a talse call on said line to cause said finder switch to hunt for and find said line, means responsive to the association of said linder switch with said line to disconnect said selector troni said line, an indicating mechanism, and means under the control oi said inder switch for transmitting impulses to said indicating mechanism to position it to indicate the identity of said line.

i6. ln a telephone system, a subscribers line, a selector switch for extending calls from said line, a. register' sender for controlling said selector switch, means responsive to the initiation ot a call on said line to associate 'd selector switch and said sender with said line, auxiliary means responsive to a false call on said line to connect said line with an operators position independent of said selector switch,` a pair of switches, means for transmitting impulses from said finder switch during its hunting operation to operate said pair ot switches, and means including said switches tor indicating the identit-y of said line.

17. In a telephone system, subscribers lines, line finders having terminal blanks in which said lines appear, another finder switch having access to said lines in multiple with line iinders, a register sender, means responsive to the initiation of a call on one of said lines to cause one ot said line nders to connect said line with said register sender, means in said register sender eiective if said call is a false call tc canse said other finder switch to hunt for the terminals ot said line. and means responsive to the finding ot said line by said other iinder switch to release said line nder.

1S. ln a telephone system, a suhscribers line, a selector switch 'or extending calls i ni said line, a register sender :tor controling said selector' switch, means responsive o the initiation ot a call on said line to assoi said selector switch and said sender er effective after a predetermined interval t0 advance said auxiliary switch into a predetermined position, and to release said sender from said selector switch, a finder switch, means operated in said predetermined position of said auxiliaryv switch for initiating the operation ot' said finder switch to tind said line, and means responsive to the lnding of said line by said finder switch tor releasing said selector switch.

19. In a telephone system, a subscribers line, a selector switch for extending calls troni said line,a register sender for controlling said selector switch, means responsive to the initiation of a call on said line to associate said selector switch and said sender with said line, an auxiliary switch associated with said selector switch, means in said sender effective after a predetermined interval to advance said auxiliary switch into a predetermined position, and to release said sender from said selector switch, a finder switch, means operated in said predetermined position of said auxiliary switch for initiating the operation of said .finder switch to find said line, means responsive to the4 finding of said line by said iinder switch for releasingl said selector switch, and means for extending said line over said finder switch to an operators position. c,

20. In a telephone system, a subscribers line, a selector' switch for extending calls from said line, a register sender for controlling said selector switch, means responsive to the initiation of a call on said line to associate said selector switch and said sender with said line, an auxiliary switch associated with said selector switch, means in said sender edective after a predetermined interval to advance said auxiliary switch into a predetermined position, and to release said sender from said selector switch, a finder switch, means operated in said predetermined position of said auxiliary switch tor initiating the operation of said finder switch to nd said line, means responsive to the finding of said line by said finder switch tor releasing said selector switch, means for extending said line over said iinder switch to an operators position, an indicating mechanism, and means operated by said iinder switch in hunting for said line for positioning said indicating mechanism to identity said line.

2l. In a telephone system, a subscribers line, a selector switch for extending calls from said line, a register sender for controlling said selector switch, means responsive to the initiation of a call on said line to associate said selector switch and said sender with said line, an auxiliary switch associated with said selector switch, means in said sender effective after a predetermined interval to advance said auxiliary switch into a predetermined position, and to release said sender Jfrom said selector switch, a. finder switch, means operfinder switch to anoperators position,

lfl i .Y w i 23. In a y,telephone system, subscribers 6 Y f Laicas.

ated4 in said predeterminedfpositiony of said auxiliary switch for initiating the operation ofsaid finder switchto iind said line, means responsive to the'finding ofk said line by said finder `switch for'v releasing lsaid vselector switch, means for extending said line over anhindicating mechanism y'cdmprising a vpair of switches, and means operated by said finder' f'. l

switch in hunting forsaid line lfor positioning [said indicating mechanism' to identify Y said line.

Ina telephone system, ay 'subscribershline, a Vi'alse 'call finder, means responsive to the presence ofa .false call onsaid line to cause'said false call inder to 'nd said line, f Y a pair of auxiliary switches, means operated byv saidfalse calliinder in hunting lfor said A line to transmit impulsesto said` auxiliary switches banks of lamps and. means vcon- Y trolled by said auxiliary switches for' selecf 'tively.lighting)said lamps to,identify said lines, linevl findersI having terminal banks Ain i Awhichsaidlines'appear,anotherfindenswitch .Y having access to said lines multiple with vsaidline finders,'a' register sender, means re- -sponsive to theV initiationof a call on oneof said` lines to cause o'ne'oi` said-line ndersfto connect said line withsaid` l register sender,

means insaid registerfsendereective if said callis a alsefcall'to cause said other Vnder switch to hunt for the terminals of said line, means responsive to. the'iinding of'saidiline bysaid other finderswitehtorelease said line finder, andimeans to prevent the operation' of 'Y Y saidfinderswitch while any oneof'saidv line Y f inders is hunting for one ofsaidfsubseribers lines.

1 24. IVIn' a? telephone system, plurality of l subscribersV lines, A av pluralityv of line finders each havinga plurality lot" brushes, vmeans i Vresponsive to the apparent initiation of a call onone of said'linestomark said line'to said line finders anelitov operate?V one of said lineV f fl f finders, meansr including one ofthe' brushes ofjsaidline finders for'testingfor said marked Q l 'Y lneQan auxlaryfndrSwitch;meansec tive if said call isa 'false call:v to initiatelthe l, operation of said auxiliary;finderswitclnand` l 'a means includinggsaid bru'sli'fi'or markingsaid line to said auxiliary finders-switch.

Y fIn witness-whereof, I-hereunto subscribel my name this 18th day of August, 1931. 'Q Y a WILLIAMHATTIQity 

